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Escola Superior de Agricultura Luiz de Queiroz (ESALQ) (2005)

Evapotranspiração e desenvolvimento de limeira ácida ’Tahiti’ na ausência e presença de estresse hídrico

Silva Cláudio Ricardo da

Titre : Evapotranspiração e desenvolvimento de limeira ácida ’Tahiti’ na ausência e presença de estresse hídrico

Auteur : Cláudio Ricardo da Silva

Université de soutenance : Escola Superior de Agricultura Luiz de Queiroz (ESALQ)

Grade : Doutorado 2005

Résumé
Water and physiologic relations in acid lime trees under water stress were studied with the following purposes : (a) to verify the seasonal effect of evapotranspiration and the crop coefficient in non-stressed trees by weighing lysimeter ; (b) to determine the critical soil water depletion for evapotranspiration, gas exchange as well as the leaf water potential during a stage of growing of the trees and (c) to determine the effect of the irrigation suppression on growth, yield and fruit quality during different phenological periods. The experiment was carried out an experimental farm at College of Agriculture Luiz de Queiroz (ESALQ), in Piracicaba and performed from 2003 to 2005 in a 1 hectare orchard planted with ‘Tahiti’ (Citrus latifolia Tanaka) grafted on ‘Swingle’ [Poncirus trifoliata (L.) Raf. x C. paradisi Macf. ] rootstock. The trees were spaced 7 x 4 m apart and drip-irrigated. For physiologic measurements were used portable equipments such as a pressure chamber and an infrared gas analyzer as well measurements of vegetative and productive growth. The soil water status was monitored by tensiometers and TDR probes. The reference evapotranspiration was obtained by an automatic weather station presented on the area. There was a seasonal effect on evapotranspiration with a reduction higher than 50% forward to summer-winter, being able to water savings in the period. The evapotranspiration, gas exchange and leaf water potential at predawn were decreased when the soil water available was depleted by 40% in the end of winter. The irrigation suppression from September and March decreased the soil matric potential and promoted a light stress level in non-irrigated trees, but without negative effects on vegetative, productive and fruit quality. We recommend the leaf water potential at predawn for irrigation scheduling, keeping higher than -0.6 MPa for avoid water stress in acid lime trees.

Mots clés : citric fruit, evapotranspiration, irrigation, seazonal variation, stomatal conductance, vegetative growth, water stress

Présentation

Page publiée le 13 mars 2008, mise à jour le 10 juillet 2017